Chinese Magic Mirror

The mirror is made of polished bronze, and is 10cm in diameter. On the back, cast in relief, are the signs of the Chinese Zodiac.
Shine a bright, collimated light onto the front surface of the mirror - sunlight works brilliantly - and the pattern on the back of the mirror will appear, projected on the wall or on any blank screen, and you will see the image of the Chinese Signs of the Zodiac.How is this possible? One theory says that the metal has somehow become transparent, so that the images on the back magically pass through the thickness of the mirror, and are projected from the front, mirrored side. But we don't believe that!!

If you are using sunlight, then you get the picture when you project the image onto a surface that is not in direct sunlight. If you are using an artificial light source, it should be a collimated beam. In the video Tim is using an LED torch that has a single, very bright LED, and he has also removed the reflector inside the torch.

A detailed paper about Magic Mirrors can be found here - https://michaelberryphysics.files.wordpress.com/2013/07/berry383.pdf